The Hornby R911 train speed controller power unit is a pre-built and ready-to-go unit designed for model railways and trains. With a wattage of 250W and a scale of 1:76, this analogue control system is compatible with DCC control systems. Made of plastic and branded by Hornby, this controller is a reliable and efficient choice for controlling the speed of your model train. Perfect for collectors and enthusiasts, this power unit is a must-have for any model railway setup.